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Related Experiment Video

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In Vitro Analysis of E3 Ubiquitin Ligase Function
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A HECT domain E3 enzyme assembles novel polyubiquitin chains.

J You1, C M Pickart

  • 1Department of Biochemistry and Molecular Biology, School of Public Health, Johns Hopkins University, Baltimore, Maryland 21205, USA.

The Journal of Biological Chemistry
|March 30, 2001
PubMed
Summary

This study identifies KIAA10 as a HECT-domain ubiquitin ligase (E3) that forms Lys(29)- and Lys(48)-linked polyubiquitin chains. Its C-terminal domain catalyzes chain assembly, while the N-terminal domain binds proteasomes, revealing dual roles in ubiquitination and proteasome interaction.

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CAPRRESI: Chimera Assembly by Plasmid Recovery and Restriction Enzyme Site Insertion
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Polyubiquitin chains linked through Lys(29) (K29) of ubiquitin are involved in targeting substrates to proteasomes, but their signaling functions are not well understood.
  • A previously identified erythroid ubiquitin-protein isopeptide ligase (E3) can assemble polyubiquitin chains via K29 or Lys(48) (K48) linkages.
  • HECT (homologous to E6-AP carboxyl terminus) domain E3s possess a conserved C-terminal HECT domain for ubiquitination catalysis and divergent N-terminal domains for substrate binding.

Purpose of the Study:

  • To purify and characterize the E3 enzyme responsible for assembling K29- and K48-linked polyubiquitin chains.
  • To identify the specific protein responsible for the observed E3 ligase activity.
  • To investigate the functional domains of the identified E3 ligase and its interaction with the proteasome.

Main Methods:

  • Purification of the E3 ligase using affinity chromatography with a ubiquitin-ubiquitin-conjugating enzyme fusion protein.
  • Assignment of E3 activity to the KIAA10 protein among purified polypeptides.
  • In vitro characterization of recombinant KIAA10's polyubiquitin chain assembly activity and domain interactions with proteasomes.

Main Results:

  • The E3 ligase activity was attributed to the KIAA10 protein, a member of the HECT domain E3 family.
  • Recombinant KIAA10 efficiently catalyzed the assembly of both K29- and K48-linked polyubiquitin chains.
  • The C-terminal 428 residues of KIAA10 were sufficient for polyubiquitin chain assembly, suggesting a general HECT domain function.
  • The N-terminal domain of KIAA10 interacted with purified 26 S proteasomes and the S2/Rpn1 subunit, indicating a role in proteasome binding.

Conclusions:

  • KIAA10 is a HECT domain E3 ligase capable of forming both K29- and K48-linked polyubiquitin chains.
  • The catalytic activity for polyubiquitin chain assembly resides within the C-terminal HECT domain of KIAA10.
  • The N-terminal domain of KIAA10 likely mediates proteasome binding, in addition to substrate recognition, highlighting a dual role in the ubiquitination-proteasome pathway.